TV Repair Questions? Ask a TV Technician
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Your Tv uses a lamp to project the picture onto the screen. The lamp is designed to last 4000-6000 hours then it needs to be replaced. It is fairly simple, just goes in a trap door in the Tv. Here is the lamp you need: http://www.amazon.com/Sony-KF-50WE610-Lamp-Housing-XL2100/dp/B0038BCNKI/ref=pd_cp_e_3 If you need further assistance please reply here.
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Has the lamp ever been replaced since you had the Tv? Because as I said they are designed to last 4000-6000 hours.
Just because the indicators on the front don't match what the user manual tells you they should read, does not mean the lamp has not failed. In fact they rarely do match what the manual says they are supposed to be.
Pull the old lamp out and look at it. Is is dingy and dusty? Is the reflector cracked or discolored? Is there a bulge in the base of the stem? Is the filament clean and clear or warped and burnt?
I suspect the buzzing noise is the blown lamp arcing while the ballast is firing it.